You finish the song, upload it, post about it everywhere, and watch the numbers for a week. Then you start on the next one and hope it goes better.
Most independent artists are handling every part of their career at once (the music, the release, the money, the paperwork) with no one helping them see how it all fits together. And most of the advice out there was written for someone with a different budget, a different audience and a different team.
Artist OS starts with where you actually are and helps you build from there.